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Can the following question be posted? “Where could an error be in the proposed proof of Fermat Last Theorem? Info about the author, proof and preliminary validation is at (link)”. How should the question be reformulated to not be deleted? Previously, I tried to post a similar question with more details, but it was deleted.

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That is off-topic, as is asking for correctness of claimed proofs about any famous conjecture, especially if, as I guess, it's a simple proof and the link is at viXra or ResearchGate or Google Drive/Dropbox etc. Even if it's on the arXiv, that's not going to get a free pass, since people get claimed but completely broken proofs of famous conjectures not infrequently. You should think of MathOverflow as something like a mathematics department common room. If you wouldn't barge in and start pushing a copy of your paper on everyone present asking them to check it now, then it's not suitable here. And if someone did come barging in to the common room in this way, they would be shown the door as fast as possible, which is what happens here.

Even if someone comes asking about the correctness of a random preprint they found (on Twitter or Reddit of Facebook or whatever), it's off-topic. Sometimes people come asking for such verification of their own work, but pass it off as something they just happened across, asking here under a pseudonym. Such behaviour is clearly not going to help.

There is a long history of such a policy for this and similar situations, for example:

And in case anyone thinks that this is a gate-keeping issue of the mathematics community keeping people out, see the discussion here:

https://meta.mathoverflow.net/a/3902/4177

where the matter of a preprint with a claimed proof of a famous open problem by a famous mathematician needed to be dealt with. The tl;dr is that it is still off-topic.

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    $\begingroup$ This is of course a good answer, but Re the last sentence of the first paragraph: it's not suitable even if they did barge in and pushed a copy, etc. :-) At least not before they had established credibility. An incredibly ingenious 3-page technique that had somehow been overlooked by everyone ought to be able to handle other hard problems with impressive dispatch, and this is what every amateur would-be Solver of Big Problems ought to cultivate. Such amateurs could even pose challenges in the manner of 16th century mathematicians, just to demonstrate how bloody ingenious they are. $\endgroup$
    – Todd Trimble Mod
    Feb 7 at 3:55
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    $\begingroup$ Even if the person posting is not the person who has written the alleged proof, it's still off-topic here, and has been for as long as I can remember. $\endgroup$ Feb 7 at 5:11
  • $\begingroup$ Thanks both, I will update to clarify. $\endgroup$
    – David Roberts Mod
    Feb 7 at 7:16
  • $\begingroup$ Thank you for the helpful explanation. $\endgroup$
    – shes-yu
    Feb 7 at 13:08

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